If the vertex angle of an isosceles triangle is , what is th...

Question Analysis:
This question involves the properties of isosceles triangles and the angle - sum property of a triangle.
The main focus is on using the fact that the sum of interior angles of a triangle is

and the base angles of an isosceles triangle are equal.

Key Concept Explanation:
In an isosceles triangle, the sum of the interior angles is

, i.e.,

, where

is the vertex angle and

and

are the base angles.
Also,

.

Step - by - Step Solution:
Let the vertex angle

and the base angles be

and

.
Since

and

, we can rewrite the equation as

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